{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{cccc}}
\hline\hline
                    &\multicolumn{2}{c}{(1)}  &\multicolumn{2}{c}{(2)}  &\multicolumn{2}{c}{(3)}           \\
                    &\multicolumn{2}{c}{}     &\multicolumn{2}{c}{}     &\multicolumn{2}{c}{}              \\
                    &        mean&          sd&        mean&          sd&           b         &           p\\
\hline
Age                 &       17.28&        1.25&       17.25&        1.23&        0.03         &      (0.76)\\
Female              &        0.51&        0.50&        0.49&        0.50&        0.02         &      (0.56)\\
subject\_count       &        9.69&        0.55&        9.67&        0.57&        0.02         &      (0.65)\\
standardised raw total score&       -0.00&        0.98&       -0.01&        1.01&        0.01         &      (0.92)\\
std\_MTC\_mock        &       -0.02&        1.00&        0.02&        0.99&       -0.04         &      (0.61)\\
std\_ENG\_mock        &        0.01&        0.91&       -0.01&        1.09&        0.02         &      (0.84)\\
\hline
Observations        &         344&            &         391&            &         735         &            \\
\hline\hline
\end{tabular}
}
